Siemens Aktiengesellschaft

Dieter Adelmeyer

Hartmut Duschka

Helmut Schott

In an exemplary embodiment displaceable clamping jaws mount x-ray film cassettes of varying format for movement into the exposure position. In the case of such x-ray cassette changers it is necessary that the width-definition of the cone of rays corresponds to the dimensions of the inserted x-ray film cassette. The film support, in the case of fluoroscopy, should be capable of being removed from the examination apparatus without difficulties. For this purpose, the disclosure provides that the film support and the clamping jaws are coupled with transmitters which assume positions with respect to a displacement direction of the film support in dependence on the clamping positions of the respective pairs of clamping jaws. Associated with the transmitters are receivers which, together with an actual value transmitter responsive to movement of the film support, are connected to a measured value processing arrangement. The disclosure radiographic installation is particularly suited for utilization with under-table spot film devices.

Radiographic installation comprising a film support transportable from a

In an exemplary embodiment, a roentgenographic installation, an x-ray tube aligned with respect to the roentgenographic installation, a flange-mounted, motor adjustable primary radiation diaphragm, and a patient support which is respectively longitudinally displaceable between the x-ray tube and the roentgenographic installation. The x-ray examination apparatus possesses a program control installation, with which the patient support can be displaced in a step-by-step fashion relative to the roentgenographic installation in predetermined time intervals. During angiography of the extremities, the photographic exposure field changes in size as a consequence of the advancement of the contrast medium and the related displacement of the patient support plate relative to the photographic exposure installation. This can result in lateral halations of the examination area. In order to prevent this, the disclosure provides that a diaphragm control circuit is connected to the program control installation which allocates to every photographic exposure position, actuatable by the program control installation, a separately preselectable setpoint value for the diaphragm follow-up control.

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Erlangen, Germany

Dieter Adelmeyer